I have a 15 year old daughter that I used to call my "compass" as she was such an easy child to raise. But, the last 2 years have been difficult. Now, I haven't spoken to her for 3 days because I know the result: she is grumpy, surly, rude and turns every interaction into an argument and complaint even if I am helping her. She even surprised me by being downright insulting to me when I wanted to ride a rollercoaster with her. I am worried that if we speak, she will behave the same and just perpetuate the problem. She does not have social media, but does spend every allowed minute on her phone browsing Pinterest and watching Netflix (we set limits). We have now blocked her apps so that she can only call, text, and listen to music for 2 weeks and told her that until she can change her attitude and behavior, that will be extended and may lose the phone entirely. I have told her that I love her and want to restore our relationship, but don't know why she is acting this way.